Used Mercedes-Benz GLB Lambda Sensor

Yes, but only on petrol-engined GLB variants — the 1.3-litre and 2.0-litre petrol units use lambda (oxygen) sensors as part of their exhaust management and emissions control systems. The GLB diesel variants (the 2.0-litre diesel in 200d, 220d, and 250d derivatives) do not use lambda sensors in the same way, as diesel engines manage combustion differently and rely on other sensors instead. If you have a diesel GLB and are chasing an emissions or running fault, you may actually be looking for a NOx sensor, exhaust gas temperature sensor, or something related to the SCR system — worth confirming with a breaker against your registration.

The GLB (X247) launched in the UK in 2019 and has remained on the same generation platform through to the current model, with a facelift arriving around 2023, so a 2020 and a 2022 car sit within the same pre-facelift generation. Fitment is primarily driven by engine code rather than model year alone, so you need to match the exact engine code on both cars — the 1.3-litre M282 petrol and the 2.0-litre M260 petrol each have their own sensor configurations. Provided the engine codes match, a sensor from a 2020 car is likely compatible with a 2022 car, but always confirm with the breaker using both registrations to be certain.

Trim level and badge name do not affect lambda sensor fitment — what matters is the engine code fitted to the car. The GLB 200 uses the 1.3-litre M282 four-cylinder petrol engine, while the GLB 250 uses the 2.0-litre M260 four-cylinder petrol, so these two badges do actually carry different engines and will not share the same lambda sensor. Match on engine code, not on trim name, and give the breaker your full registration so they can verify the exact specification.

The GLB X247 received its facelift around 2023, and while the core platform carried over, there can be detail changes to engine management and exhaust systems across a facelift boundary that affect sensor compatibility. It is not safe to assume a pre-facelift sensor will drop straight in even if the engine code looks the same — the safest approach is to quote both registrations to the breaker and let them check the part numbers against their stock. This is especially important if your car has any running or emissions fault, as fitting an incompatible sensor could cause further issues or an MOT failure.

Yes, position matters significantly — the pre-catalytic converter (upstream) sensor and the post-catalytic converter (downstream) sensor are different parts with different calibrations and connector types, and they are not interchangeable with each other. When contacting a breaker, specify whether you need the NS or OS sensor if there are multiple, and whether it is the upstream (before the cat) or downstream (after the cat) unit. Give the breaker your registration and describe the sensor's location on the vehicle so they can pull the correct part from their donor car.

It is possible that the same engine code used across the GLA, A-Class, and GLB could share lambda sensor part numbers, since Mercedes-Benz commonly carries engines across model families. However, exhaust routing and packaging differences between models can mean connectors, cable lengths, or mounting positions vary even with the same core sensor, so this is not guaranteed. Always cross-reference part numbers with the breaker using both registrations rather than assuming engine-code compatibility alone is enough to confirm a fit.